/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package at.irian.demo.jsfatwork.view.util;

import org.apache.myfaces.orchestra.conversation.ConversationManager;
import org.apache.myfaces.extensions.validator.util.ExtValUtils;

import javax.faces.context.FacesContext;
import java.util.Collection;
import java.util.Map;

import at.irian.demo.jsfatwork.view.security.UserHolder;

/**
 * @author Gerhard Petracek
 */
public class JsfUtils
{
    public static boolean isNullOrEmpty(Object o)
    {
        if (o != null)
        {
            if (o instanceof String)
            {
                return o.equals("");
            }
            else if (o instanceof Collection)
            {
                return ((Collection) o).size() < 1;
            }
            else if (o instanceof Map)
            {
                return ((Map) o).size() < 1;
            }
        }
        return o == null;
    }

    /**
     * @return current conversation context id for get requests
     */
    public static Long getCurrentConversationContextId()
    {
        return ConversationManager.getInstance().getCurrentConversationContext().getId();
    }

    public static boolean performSecurityCheck()
    {
        UserHolder userHolder = (UserHolder) ExtValUtils.getELHelper().getBean("userHolder"); //reuse extval utils (not required)

        if (userHolder == null || userHolder.getCurrentUserName() == null)
        {
            FacesContext facesContext = FacesContext.getCurrentInstance();
            if(isSecuredPage(facesContext))
            {
                showLoginPage();
                return false;
            }
        }
        return true;
    }

    public static boolean isSecuredPage(FacesContext facesContext)
    {
        String viewId = facesContext.getViewRoot().getViewId();

        return !(viewId.endsWith("/pages/registration.xhtml") || viewId.endsWith("/pages/lock.xhtml"));
    }

    public static void showLoginPage()
    {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        facesContext.getApplication().getNavigationHandler().handleNavigation(facesContext, null, "pages/login");
        facesContext.renderResponse();
    }
}
